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Loudness of sounds with a subcritical bandwidth

 
: Hots, Jan; Rennies, Jan; Verhey, Jesko Lars

:

Journal of the Acoustical Society of America : JASA 131 (2012), No.4, pp.3517
ISSN: 0001-4966
ISSN: 1520-8524
English
Journal Article
Fraunhofer IDMT ()

Abstract
The predicted loudness for narrowband signals with bandwidths smaller than the bandwidth of the auditory filter, i.e., with a subcritical bandwidth, depends on the type of loudnessmodel. While modelsanalyzing the long-term spectrum (stationary loudnessmodels) predict loudnesses for these subcritical signals which are independent of the bandwidth of the sound,models sensitive to the temporal structure of the signal (dynamic loudnessmodels) predict higher loudnesses for narrowband noise signals than for tones due to the inherent level fluctuations of the noise. The present study measures the loudness of subcritical sounds for center frequencies of 750, 1500, and 3000 Hz. For all three center frequencies, the level of the narrowband noise had to be up to 5 dB higher than the level of the equally-loud tone at the center frequency. This experimental finding is at odds with both predictions, i.e., the loudness is neither the same for all signals nor is the level of the narrowband noise smaller than that of the equally-loud tone. The data indicate a special character of sounds with a distinct tonal character which is not accounted for in current loudnessmodels.

: http://publica.fraunhofer.de/documents/N-343397.html